JVC MX-J30 Service Manual page 50

MX-J30/MX-J330/MX-J35R
@ Tape Recorder Section
Measurement Standard Adjusting
|| a 2 Measurement method
Confirmation | Test tape 1.Playback the test tape TMT7036(10kHz). Maximum Adjust the head
of head angle} :TMT7036(10kHz) 2.With the playback mechanism or recording & output azimuth screw
Measurement playback mechanism, adjust the head azimuth only when the
head has been
changed.
output terminal
:Speaker terminal
screw so that the forward and reverse output
levels become maximum.After adjustment,lock
Speaker R the head azimuth at least by half a turn.
(Load resistor:3 9) 3.In either case,this adjustment should be
:Headphone terminal performed in both the forward and reverse
directions with the head azimuth screw.
Tape speed
of decks
(A and B)
:3,000H2
+60Hz
Confirmation | Test tape <Constant speed>
of tape speed) 77 7142(3kHz) or Adjust VR301 so that the frequency counter reading
TMT7036(3kHz) becomes 3,000Hz+60Hz when playing back the
Measurement test tape VTT712(3kHz)with the playback mechanism
output terminal or playback and recording mechanism after ending
:Headphone terminal | forward winding of the tape.
M@ Reference Values for Confirmation items
Measurement Standard Adjusting
(Load resistance:3 2 )
measurement
output terminal
'Headphone terminal
60Hz or
less
Difference
between the
forward and
reverse speed.
Pmecha and
R/P mecha
speed
When the test tape VTT712(3kHz) has been played
back with the playback mechanism or recording and
playback mechanism at the beginning of forward
winding, the frequency counter reading of the
difference between both of the mechanisms should
be 6.0Hz or less.
Both the playback
and recording &
playback
mechanism
with in
0.25%
JIS(WTD)
When the test tape VTT712(3kHz) has been played
back with the playback mechanism or recording and
playback mechanism at the beginning of forward
winding the frequency counter reading of wow &
flutter should be 0.25% or less(WRMS).
Wow & flutter | Test tape
:TMT7036(10kHz)
Measurement
output terminal
'Headphone terminal
Both the playback
and recording &
playback
mechanism
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